remove obsolete sentence
diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index fce4d49..ea355af 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -347,10 +347,7 @@
error-reporting behavior from the platform C implementation. As a result,
the specific exceptions raised in error cases (and even whether some
arguments are considered to be exceptional at all) are not defined in any
- useful cross-platform or cross-release way. For example, whether
- ``math.log(0)`` returns ``-Inf`` or raises :exc:`ValueError` or
- :exc:`OverflowError` isn't defined, and in cases where ``math.log(0)`` raises
- :exc:`OverflowError`, ``math.log(0L)`` may raise :exc:`ValueError` instead.
+ useful cross-platform or cross-release way.
All functions return a quiet *NaN* if at least one of the args is *NaN*.
Signaling *NaN*\s raise an exception. The exception type still depends on the